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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi Ivan and Mrtrix users,
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<div>I have just experienced the same problem with streamtrack SD_PROB. It does not produce any streamlines and hangs although still uses a lot of CPU. I think it might have something to do with the SH harmonic coefficient file (source argument in streamtrack),
since when I use a harmonic coefficient file from a different scan it works fine (all other arguments were the same files). I need to find a solution to this also.</div>
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<div>Best,</div>
<div>Chris<br>
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<div id="divRpF580734" style="direction: ltr; "><font face="Tahoma" size="2" color="#000000"><b>From:</b> mrtrix-discussion-bounces@www.nitrc.org [mrtrix-discussion-bounces@www.nitrc.org] on behalf of Ivan Alvarez [ivan.alvarez.11@ucl.ac.uk]<br>
<b>Sent:</b> 09 January 2013 15:03<br>
<b>To:</b> mrtrix-discussion@www.nitrc.org<br>
<b>Subject:</b> [Mrtrix-discussion] Human Connectome Project dataset issue<br>
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<div>Hello Mrtrix users,<br>
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I tried analysing a sample subject from the recently available Human Connectome Project dataset (<a class="moz-txt-link-freetext" href="https://db.humanconnectome.org" target="_blank">https://db.humanconnectome.org</a>), and encountered an issue with CSD tractography
in Mrtrix. In brief, the dataset has 1.25 mm isotropic voxels, 270 directions, 3 b-shells (1000,2000,300) and 2 repeats.<br>
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The tensor estimation worked fine, and am able to compute sensible-looking FA maps. The mask erosion is also fine, but when I view the response function coefficient, it displays an unusual shape (<a href="http://postimage.org/image/cl7tpwc3p/" target="_blank">RCF</a>).
The csdeconv command returns no errors and the orientation plot looks reasonable. My problem is, when I attempt to perform tractography with the streamtrack command, the program hangs.<br>
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Any idea as to why this might be?<br>
<pre class="moz-signature" cols="72">--
Kind regards,
Ivan Alvarez
PhD Candidate
Imaging and Biophysics Unit
UCL Institute of Child Health
30 Guilford Street, London, WC1N 1EH</pre>
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